Department of Physiological Nursing

Résumé:
Nous présentons une méthode d’extraction des réseaux vasculaires en angiographie cardiaque RX, basée sur une technique de suivi de l’axe du vaisseau. La méthode s’appuie sur une modélisation du vaisseau par un tube et sur un opérateur moment pour extraire la position de ce tube, son orientation et son diamètre local. Les résultats présentés sur deux images, issues de deux séquences acquises selon deux points de vue différents, montrent l’efficience de la méthode.

Most-Clés : Angiography RX, Extraction des coronaires, Moments Geometriques 2D, Suivi de structures

Abstract—We present in this letter an efficient direct method for the computation of a length-  type-II generalized discrete Hartley transform (GDHT) when given two adjacent length-  􏰀 GDHT coefficients. The computational complexity of the proposed method is lower than that of the traditional approach for length 􏰁. The arithmetic operations can be saved from 16% to 24% for varying from 16 to 64. Furthermore, the new approach can be easily implemented.

Index Terms—Compressed-domain processing, discrete Hartley transform, fast algorithm.

Recently, there has been a great deal of research into XML query languages to enable the execution of database-style queries over XML files. However, merely being an XML query-processing engine does not render a system suitable for querying the Internet. A useful system must provide ...

This paper describes an authoring tool for mobile phone Augmented Reality (AR) applications. This work is based on earlier work at the HIT Lab NZ on a tool for authoring PC based AR applications called ComposAR. In this paper, we describe modifications to ComposAR that allows end-users to prototype mobile AR applications on a PC, and mobile player software that will allow the prototype applications to be delivered on a mobile phone. In this way, end-users with little programming experience can develop ...

Star polymers with a hydrophobic cholane core and four poly (ethylene glycol)(PEG) arms, CA (EGn) 4, have been synthesized by anionic polymerization. Pulsed-gradient spin-echo NMR spectroscopy was used to study the diffusion behavior of the star polymers, ranging from 1000 to 10,000 g/mol, in aqueous solutions and gels of poly (vinyl alcohol)(PVA) at 23° C. The star polymers have a lower self-diffusion coefficient than linear PEGs at equivalent hydrodynamic radius. In water alone, the star polymers and their linear homologues have ...

The fundamental relaxation result for Lipschitz differential inclusions is the Filippov-Wažewski Relaxation Theorem, which provides approximations of trajectories of a relaxed inclusion on finite intervals. A complementary result is presented, which provides approximations on infinite intervals, but does not guarantee that the approximation and the reference trajectory satisfy the same initial condition.

This paper continues the study of the integral input-to-state stability (iiss) property. It is shown that the iiss property is equivalent to one which arises from the consideration of mixed norms on states and inputs, as well as to the superposition of a "bounded energy bounded state" requirement and the global asymptotic stability of the unforced system. A semiglobal version of iiss is shown to imply the global version, though a counterexample shows that the analogous fact fails for input to state stability (iss). The results in this note complete the basic theoretical picture regarding iiss and iss.

The fundamental Filippov-Wažwski Relaxation Theorem states that the solution set of an initial value problem for a locally Lipschitz inclusion is dense in the solution set of the same initial value problem for the corresponding relaxation inclusion on compact intervals. In our recent work, a complementary result was provided for inclusions with finite dimensional state spaces which says that the approximation can be carried out over non-compact or infinite intervals provided one does not insist on the same initial values. This note extends the infinite-time relaxation theorem to the inclusions whose state spaces are Banach spaces. To illustrate the motivations for studying such approximation results, we briefly discuss a quick application of the result to output stability and uniform output stability properties.

XML has become the de facto standard format for web publishing and data transportation. Since online information changes frequently, being able to quickly detect changes in XML documents is important to Internet query systems, search engines, and continuous query systems. ...

In this note we show that for a given controllable pair (A, B) and any λ > 0, a gain matrix K can be chosen so that the transition matrix e (A+BK)t of the systemẋ = (A + BK)x decays at the exponential rate e −λt and the overshoot of the transition matrix can be bounded by M λ L for some constants M and L that are independent of λ. As a consequence, for any h > 0, a gain matrix K can be chosen so that the magnitude of the transition matrix e (A+BK)t can be reduced by 1 2 (or by any given portion) over [0, h]. An interesting application of the result is in the stabilization of switched linear systems with any given switching rate (see [1]).

The ability of three sorbents (untreated Ca(OH) 2 , MnO 2 -impregnated Ca(OH) 2 and Ag-impregnated Ca(OH) 2 ) removing the elemental mercury had been studied using a laboratory-scale fixed-bed reactor at 80 • C under simulated fuel gas conditions. The adsorption performance of the three sorbents was compared by mercury removal efficiency and adsorption capacity. The effect of acid gases such as HCl and SO 2 on the mercury removal was investigated and presented in this article. The results showed that the mercury removal by Ca(OH) 2 was mainly controlled by physical mechanisms. In the case of Ca(OH) 2 , the presence of both SO 2 and HCl promoted the Hg 0 removal, and compared HCl with SO 2 , HCl had a higher mercury removal than SO 2 . Ca(OH) 2 impregnated with MnO 2 had a slightly higher mercury removal than the original Ca(OH) 2 , but it was beneficial for mercury speciation. The presence of both SO 2 and HCl promotes the Hg 0 removal greatly, which was adsorbed by Ca(OH) 2 impregnated with MnO 2 . The Ca(OH) 2 impregnated with MnO 2 adsorbed more than 50% total Hg due to the occurrence of chemisorptions. The mercury removal by Ca(OH) 2 impregnated with Ag was the highest. The reason might be that mercury integrated with silver easily that could produce silver amalgam alloy. 

Membranes used in municipal membrane bioreactor (MBR) plants can be configured as flat sheet (FS) membranes or hollow fibre (HF) membranes. The HFs can be mounted either horizontally or vertically. The membranes can be immersed in their own vessel or within the aerobic vessel. These various configurations combine to give a unique reactor design. Current methods of design assume the mixing characteristics (e.g. each reactor vessel is completely mixed); hence the energy necessary to achieve complete mixing cannot be optimised. This paper presents an overview of mixing studies undertaken by the authors' research group on pilot-and full-scale MBRs through residence time distribution (RTD) analysis and computational fluid dynamics (CFD) modelling. The drawbacks of current technique for the sizing of MBRs (e.g. compartmental modelling) are highlighted. The use of CFD as a design tool to evaluate the mixing and energy of MBRs with different configurations (e.g. HF vs FS, inside submerged vs outside submerged) is presented. The MBR CFD model was validated using field-measured RTD data and compared with compartmental model. Results from mixing studies suggest that HF membranes are more energy efficient in terms of creating completely mixed conditions than the FS membranes. 

The goal of this paper is to provide a Lyapunov statement and proof of the recent nonlinear small-gain theorem for interconnected input/state stable (iss) systems. An iss-Lyapunov function for the overall system is obtained from the corresponding Lyapunov functions for both the subsystems.

The aspartic acid residues (Asp) present in the complementarity-determining regions (CDRs) of the light chains of two recombinant monoclonal antibodies (MAbs), MAb I and MAb II, are highly susceptible to isomerization due to the presence of glycine residues (Gly) on their C-terminal ends. Asp isomerization in these MAbs leads to formation of the isoaspartate (IsoAsp) and the cyclic imide (Asu) variants of these MAbs. Both MAb I and MAb II, employed in this study, elicit their pharmacological responses through binding human IgE. The formation of the MAb variants as a result of Asp isomerization significantly reduces the binding affinities of these antibodies to IgE, thereby reducing their potencies.